over one's head

adjective4

1. •
   More complex or confusing than one can understand; beyond one’s comprehension.

   • This is way over my head. Can you explain it more simply?
2. •
   More than one can handle; too much (especially in over one's head).

   • I’m in over my head on this project. Can you help?
3. •
   Directed to someone with authority over the person, so as to avoid requiring the approval of the person himself or herself.

   • [Y]ou suspect that he's building a case to go over your head and talk to your boss about performance in your section. — 2005
4. •
   Performing at a level greatly superior to one's usual level of performance.

   • He just shot a spectacularly over his head round of golf and beat all of us.